Admin Panel doesn't work if CREATE_QUESTIONS is ON

Steps to Reproduce:

1. Log in JCommune forum as an admin user -> go to Administration mode
2. Find your Branch and click Edit Permissions
3. In CREATE_QUESTIONS click Edit, choose any group and Save
4. Log in Admin Panel on Poulpe -> Components -> JCommune
5. Choose your Section -> right mouse click on your branch -> Permissions
6. Click on Edit Permissions for the branch

AR: Admin Panel is not accessible. Error 500.
ER: Admin Panel is accessible and can be worked with.

Link to the video
http://screencast.com/t/mbphxF2DIq